CN114877066A - Control method for operation of automatic transmission, automatic transmission and vehicle - Google Patents
Control method for operation of automatic transmission, automatic transmission and vehicle Download PDFInfo
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- CN114877066A CN114877066A CN202210504152.XA CN202210504152A CN114877066A CN 114877066 A CN114877066 A CN 114877066A CN 202210504152 A CN202210504152 A CN 202210504152A CN 114877066 A CN114877066 A CN 114877066A
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- 238000000034 method Methods 0.000 title claims abstract description 37
- 230000005540 biological transmission Effects 0.000 title claims description 77
- 230000007935 neutral effect Effects 0.000 claims abstract description 106
- 238000001514 detection method Methods 0.000 claims description 24
- 230000008859 change Effects 0.000 claims description 16
- 230000009471 action Effects 0.000 claims description 10
- 230000007246 mechanism Effects 0.000 claims description 5
- 238000000926 separation method Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 239000000446 fuel Substances 0.000 description 3
- 230000009977 dual effect Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H59/00—Control inputs to control units of change-speed-, or reversing-gearings for conveying rotary motion
- F16H59/14—Inputs being a function of torque or torque demand
- F16H59/24—Inputs being a function of torque or torque demand dependent on the throttle opening
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H59/00—Control inputs to control units of change-speed-, or reversing-gearings for conveying rotary motion
- F16H59/36—Inputs being a function of speed
- F16H59/44—Inputs being a function of speed dependent on machine speed of the machine, e.g. the vehicle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H61/20—Preventing gear creeping ; Transmission control during standstill, e.g. hill hold control
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H2061/0015—Transmission control for optimising fuel consumptions
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H61/20—Preventing gear creeping ; Transmission control during standstill, e.g. hill hold control
- F16H2061/207—Preventing gear creeping ; Transmission control during standstill, e.g. hill hold control by neutral control
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H2312/00—Driving activities
- F16H2312/10—Inching
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
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- Control Of Transmission Device (AREA)
Abstract
The invention relates to a control method for operation of an automatic gearbox, the automatic gearbox and a vehicle, wherein the control method comprises the following steps: acquiring a first running state parameter of a vehicle; judging whether the first running state parameter meets a first preset condition or not; controlling the automatic gearbox to enter a neutral sliding state according to the condition that the first running state parameter meets a first preset condition; acquiring an opening parameter of an accelerator pedal; judging whether the opening degree parameter meets a second preset condition or not; and controlling the automatic gearbox to exit from the neutral sliding state according to the condition that the opening parameter meets a second preset condition. The control method provided by the invention reduces the frequency of entering and exiting the neutral sliding mode, increases the time ratio of the neutral sliding, reduces the oil consumption of the whole vehicle and improves the heat management performance.
Description
Technical Field
The invention relates to the technical field of vehicle gearboxes, in particular to a control method for operation of an automatic gearbox, the automatic gearbox and a vehicle.
Background
This section provides background information related to the present disclosure only and is not necessarily prior art.
An automatic Transmission (AMT) of an electric control Mechanical type does not need a driver to shift gears, labor intensity is greatly reduced, oil consumption can be saved, and AMT matching of vehicles is more and more common. The neutral sliding is used as an optional control strategy of the AMT, when a driver looses an accelerator pedal, the gearbox is in neutral through controlling a clutch after an allowed time, the transmission is in neutral, the transmission resistance transmitted by a transmission system is reduced, the sliding distance of the whole vehicle is further increased, and therefore the purpose of saving oil is achieved.
When a driver steps on the accelerator, the gearbox can be quickly combined with the clutch to shift into a corresponding gear. However, the driving habit of the driver often causes the gearbox to exit from the neutral coasting mode by stepping on the accelerator or stepping on the accelerator by a small opening degree to maintain the vehicle speed, so that the entering and exiting times of the neutral coasting mode are frequent, and the oil saving effect of the neutral coasting mode is not obvious.
Disclosure of Invention
The invention aims to at least solve the problem that the entering and exiting times of the neutral coasting mode are frequent only because a driver frequently steps on the accelerator.
The purpose is realized by the following technical scheme:
the technical scheme of the first aspect of the invention provides a control method for the operation of an automatic gearbox, which comprises the following steps: acquiring a first running state parameter of a vehicle; judging whether the first running state parameter meets a first preset condition or not; controlling the automatic gearbox to enter a neutral sliding state according to the condition that the first running state parameter meets the first preset condition; acquiring an opening parameter of an accelerator pedal; judging whether the opening degree parameter meets a second preset condition or not; and controlling the automatic gearbox to exit from a neutral sliding state according to the condition that the opening degree parameter meets the second preset condition.
According to the control method for the operation of the automatic gearbox, provided by the invention, the automatic gearbox is controlled to exit the neutral sliding mode when the opening parameter of the accelerator pedal meets the second preset condition by setting the second preset condition, so that the condition that the automatic gearbox exits the neutral sliding mode only by stepping on the accelerator is avoided, the frequency of entering and exiting the neutral sliding mode is reduced, the time ratio of the neutral sliding is increased, the oil consumption of the whole vehicle is reduced, and the heat management performance is improved.
In addition, the control method for the operation of the automatic transmission according to the present invention may further have the following additional technical features:
in some embodiments of the invention, the opening parameter of the accelerator pedal comprises: a percent opening of the accelerator pedal; the meeting of the second preset condition comprises the following steps: the percentage opening degree of the accelerator pedal is greater than a first limit value and less than a second limit value and lasts for a first time period; or the percentage opening degree of the accelerator pedal is larger than a second limit value and lasts for a second time period; wherein the second limit is greater than the first limit and the first time period is greater than the second time period.
In some embodiments of the invention, the opening parameter of the accelerator pedal comprises: a rate of change of percent opening of the accelerator pedal; the meeting of the second preset condition comprises: the change rate of the percentage opening of the accelerator pedal is greater than a third limit value and less than a fourth limit value and lasts for a third time period; or the rate of change of the percent opening of the accelerator pedal is greater than a fourth limit for a fourth period of time; wherein the fourth limit is greater than the third limit and the third time period is greater than the fourth time period.
In some embodiments of the invention, the first operating state parameter comprises: a driving speed, a gradient, an opening degree of an accelerator pedal, a rotating speed of an engine of the vehicle, a braking state of the vehicle, and a transmission operating mode of the vehicle;
the first operation state parameter meeting a first preset condition comprises: the running speed is within a first preset speed range, the gradient is within a first preset gradient range, the opening degree of an accelerator pedal is smaller than a calibrated opening degree value, the rotating speed of an engine of the vehicle is smaller than a first calibrated rotating speed value, the vehicle is in a non-braking state, and a gearbox of the vehicle is in an automatic mode; wherein the calibrated opening value is smaller than the first limit value.
In some embodiments of the present invention, controlling the automatic transmission to enter the neutral coasting state according to the first operating state parameter satisfying the first preset condition further comprises: acquiring the running speed of the vehicle; judging whether the running speed is in a second preset speed range or not; if not, controlling the automatic gearbox to exit from a neutral sliding state; wherein the first preset speed range is within the second preset speed range.
In some embodiments of the present invention, controlling the automatic transmission to enter the neutral coasting state according to the first operating state parameter satisfying the first preset condition further comprises: acquiring the gradient of the vehicle; judging whether the gradient is in a second preset gradient range or not; if not, controlling the automatic gearbox to exit from a neutral sliding state; wherein the first predetermined gradient range is within the second predetermined gradient range.
In some embodiments of the present invention, controlling the automatic transmission to enter the neutral coasting state according to the first operating state parameter satisfying the first preset condition further comprises: acquiring the rotating speed of an engine of the vehicle; judging whether the rotating speed is greater than a second calibrated rotating speed value or not; if so, controlling the automatic gearbox to exit from a neutral sliding state; and the second calibrated rotating speed value is greater than the first calibrated rotating speed value.
In some embodiments of the present invention, controlling the automatic transmission to enter the neutral coasting state according to the first operating state parameter satisfying the first preset condition further comprises: acquiring the running mode of a brake-shaped or automatic gearbox of the vehicle; and controlling the automatic gearbox to exit a neutral coasting state when the vehicle is in a braking state or the automatic gearbox of the vehicle is in a manual mode.
A second aspect of the present invention provides an automatic transmission that operates according to the method for controlling operation of an automatic transmission according to the first aspect, the automatic transmission including: a clutch actuator; a transmission controller comprising a transmission control device and a computer readable storage medium, the transmission control device configured to read and execute control instructions in the computer readable storage medium, the transmission control device comprising: the acquiring unit is used for acquiring a first running state parameter and an opening parameter of an accelerator pedal; the judging unit is used for judging whether the first running state parameter meets a first preset condition or not and judging whether the opening degree parameter meets a second preset condition or not; and the control unit controls the clutch actuating mechanism to execute a separation action to enable the automatic gearbox to enter a neutral coasting state according to the condition that the first running state parameter meets the first preset condition, and controls the clutch actuating mechanism to execute an engagement action to enable the automatic gearbox to exit the neutral coasting state according to the condition that the opening degree parameter meets the second preset condition.
According to the automatic gearbox provided by the invention, the second preset condition is set, so that when the opening parameter of the accelerator pedal meets the second preset condition, the control unit controls the clutch executing mechanism to execute the engaging action to enable the automatic gearbox to exit from the neutral sliding mode, and the condition that the automatic gearbox exits from the neutral sliding mode only by pressing the accelerator by a driver is avoided, so that the entering and exiting frequency of the neutral sliding mode is reduced, the time ratio of the neutral sliding is increased, the fuel consumption of the whole vehicle is reduced, and the heat management performance is improved.
A third aspect of the invention proposes a vehicle comprising:
the automatic gearbox in the technical scheme of the second aspect; a vehicle speed sensor for detecting a vehicle running speed; a gradient sensor for detecting a gradient of a road on which the vehicle is located; the accelerator opening detection device is used for detecting an opening parameter of an accelerator pedal of the vehicle; rotation speed detection means for detecting a rotation speed of an engine of the vehicle; the brake detection device is used for detecting the brake state of the vehicle; the speed sensor, the gradient sensor, the accelerator opening degree detection device, the rotating speed detection device and the brake detection device are all electrically connected with a gearbox controller of the automatic gearbox.
According to the vehicle provided by the technical scheme of the third aspect of the invention, the operation of the automatic transmission is controlled according to the control method for the operation of the automatic transmission in the technical scheme of the first aspect, so that the condition that the vehicle exits from the neutral sliding mode only by pressing an accelerator by a driver is avoided, the frequency of entering and exiting from the neutral sliding mode is reduced, the time ratio of neutral sliding is increased, the fuel consumption of the whole vehicle is reduced, and the heat management performance is improved.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like parts are designated by like reference numerals throughout the drawings. In the drawings:
fig. 1 schematically shows a flow chart of a control method of operation of an automatic transmission according to a first embodiment of the invention;
FIG. 2 schematically illustrates a flow chart of a method of controlling operation of an automatic transmission according to one embodiment of the present invention;
FIG. 3 schematically illustrates a flow chart of a method of controlling operation of an automatic transmission according to an embodiment of the present invention;
FIG. 4 schematically illustrates a flow chart of a method of controlling operation of an automatic transmission according to an embodiment of the present invention;
FIG. 5 schematically illustrates a schematic diagram of an automatic transmission according to an embodiment of the present invention;
fig. 6 schematically shows a schematic view of a vehicle according to an embodiment of the invention.
The reference numbers are as follows:
100-automatic gearbox, 110-clutch actuator, 120-gearbox controller, 121-acquisition unit, 122-judgment unit, 123-control unit,
200-vehicle, 201-vehicle speed sensor, 202-gradient sensor, 203-accelerator opening degree detection device, 204-rotating speed detection device and 205-brake detection device.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
It is to be understood that the terminology used herein is for the purpose of describing particular example embodiments only, and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" may be intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises," "comprising," "including," and "having" are inclusive and therefore specify the presence of stated features, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and/or groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order described or illustrated, unless specifically identified as an order of performance. It should also be understood that additional or alternative steps may be used.
Although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms may be only used to distinguish one element, component, region, layer or section from another region, layer or section. Terms such as "first," "second," and other numerical terms when used herein do not imply a sequence or order unless clearly indicated by the context. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments.
For convenience of description, spatially relative terms, such as "inner", "outer", "lower", "below", "upper", "above", and the like, may be used herein to describe one element or feature's relationship to another element or feature as illustrated in the figures. Such spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" or "over" the other elements or features. Thus, the example term "below … …" can include both an up and down orientation. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
As shown in fig. 1, according to an embodiment of the present invention, there is provided a control method of an operation of an automatic transmission, the control method including:
step S101: acquiring a first running state parameter of a vehicle;
step S102: judging whether the first operation state parameter meets a first preset condition, if so, executing a step S103, otherwise, executing a step S101:
step S103: controlling the automatic gearbox to enter a neutral coasting state;
step S104: acquiring an opening parameter of an accelerator pedal;
step S105: judging whether the opening degree parameter meets a second preset condition, if so, executing a step S106, and if not, executing a step S104;
step S106: and controlling the automatic gearbox to exit from the neutral coasting state.
In steps S101 to S103, when the first operating state parameter satisfies the first preset condition, it indicates that the vehicle is in a safe range, and therefore the automatic transmission is controlled to enter the neutral coasting state to achieve the purpose of saving fuel. In detail, the first operating state parameters include a running speed V, a gradient a, an opening degree rAPP of an accelerator pedal, a rotation speed nEng of an engine of the vehicle, a braking state of the vehicle, and a transmission operating mode of the vehicle. Satisfying the first preset condition includes: the driving speed is in a first preset speed range (V1, V2), the gradient of a road where the vehicle is located is in the first preset gradient range (a1, a2), the opening degree of an accelerator pedal is smaller than a calibrated opening degree value rAPP1, the rotating speed of an engine of the vehicle is smaller than a first calibrated rotating speed value nEng1, the vehicle is in a non-braking state, and a gearbox of the vehicle is in an automatic mode.
It should be noted that, because the neutral coasting has a potential safety hazard of braking the vehicle, the running speed of the vehicle is controlled within the first preset speed range (V1, V2), so as to avoid the vehicle running speed from being too fast, and the vehicle is always within the safe braking range. The lowest speed V1 and the highest speed V2 in the first preset speed range are subjected to specific speed values according to a neutral coasting test of different kinds of vehicles to ensure safe braking of the vehicles.
Similarly, the first predetermined gradient range (a1, a2) is also a gradient value that ensures safe braking of the vehicle based on a neutral coasting test of different types of vehicles.
The condition that the opening degree of the accelerator pedal is smaller than the calibrated opening degree value rAPP1 is used for judging that the actual opening degree of the accelerator is 0, namely when the opening degree of the accelerator pedal is smaller than the calibrated opening degree value rAPP1, the actual opening degree of the accelerator is judged to be 0, and at the moment, the driver does not have the intention of accelerating, and the automatic gearbox can be controlled to enter a neutral sliding state. The purpose of setting the calibration opening value rAPP1 is to reserve a certain range for judging that the accelerator opening is 0 so as to prevent misjudgment caused by accelerator signal burrs. For example, in one particular embodiment, rAPP1 is set to 1%, i.e., when the throttle opening is less than 1%, then the condition for neutral coasting is met. In another exemplary embodiment, the opening of the accelerator pedal is less than the nominal opening value rAPP1 and less than a continuous nominal time T, which may be set as the case may be.
The first calibration rotating speed value nEng1 is a limit value for judging whether the engine is overspeed, and when the engine speed is greater than the first calibration rotating speed value nEng1, the engine speed is indicated to be too high, and the potential safety hazard of vehicle braking exists in the state. When the engine speed is lower than the first calibrated speed value nEng1, the engine speed is in a safe range, and the vehicle braking safety is high in the state. Specifically, in one exemplary embodiment, the first calibrated speed value nEng1 may be set to the rated speed of the engine.
When the vehicle is in a braking state, the driver has the intention of braking and decelerating, so the vehicle exits from the neutral sliding mode in time, the clutch of the gearbox executes the combination action, the transmission system and the engine of the engine are tightly combined together, the rotating speed of the engine is slowed down, and a braking force, namely the engine brake, is generated for the vehicle running by inertia. Therefore, on one hand, the brake drum can be prevented from being seized by the instant brake pressure to reduce the brake effect; on the other hand, the braking action of the left wheel and the right wheel can be kept balanced, so that the vehicle can be stopped stably and slowly.
In the steps S104 to S106, the opening parameter of the accelerator pedal is obtained, and when the opening parameter of the accelerator pedal meets a second preset condition, the automatic gearbox is controlled to exit the neutral coasting, so that the condition that the automatic gearbox exits the neutral coasting mode as long as a driver steps on the accelerator is avoided, and the entering and exiting frequency of the neutral coasting mode is reduced.
In one exemplary embodiment, the opening parameter includes a percentage opening rAPP of the accelerator pedal, and the satisfaction of the second preset condition includes: the percentage opening of the accelerator pedal is greater than the first limit rAPP2 and less than the second limit rAPP3 for a first period of time T1; or the percentage opening of the accelerator pedal is greater than the second limit rAPP3 for a second time period T2, and rAPP2< rAPP3, T2< T1. In the embodiment, when the percentage opening degree rAPP of the accelerator pedal is between a first limit value rAPP2 and a second limit value rAPP3 (namely rAPP2< rAPP < rAPP3) and lasts for T1 time, the driver is considered to have certain power demand, and in order to meet the power demand of the driver, the automatic gearbox is controlled to exit the neutral coasting state. And when the percentage opening degree rAPP of the accelerator pedal is larger than the second limit value rAPP3 and lasts for T2 time, the driver has stronger power demand, and therefore the automatic gearbox is controlled to exit the neutral coasting state. It should be noted that the time periods T1 and T2 are respectively set to determine whether the driver mistakenly steps or slightly steps on the accelerator, so as to eliminate the interference of the driver mistakenly stepping or frequently stepping on the accelerator, and if the accelerator percentage opening is between rAPP2 and rAPP3 but the duration is less than T1, it is determined that the driver mistakenly steps or slightly steps on the accelerator, and at this time, the automatic transmission continues to slide in the neutral position, and if the accelerator percentage opening is greater than rAPP3 but the duration is less than T2, it is determined that the driver mistakenly steps or slightly steps on the accelerator, and at this time, the automatic transmission continues to slide in the neutral position, so as to avoid the interference of the driver mistakenly stepping, and achieve the purpose of reducing the exit frequency of the neutral position sliding. It should be noted that when the percentage opening rAPP of the accelerator pedal is greater than the second limit rAPP3, which indicates that the driver's power demand is strong, the duration of T2 is set to a short period of time, for example, 0.5s, to facilitate immediate exit from neutral coasting to respond quickly to the driver's power demand. When rAPP2< rAPP3 indicates that the driver has a certain power demand, to further avoid confusion with driver misstep behavior, the duration of T1 may be set to a longer period of time, e.g., 1s, 1.5s, or 2 s. Wherein the first limit value rAPP2 is greater than the nominal opening value rAPP 1.
In an exemplary embodiment, the opening parameter further comprises a rate of change grd of the percentage opening of the accelerator pedal, and the satisfaction of the second preset condition comprises: the rate of change of percentage opening of the accelerator pedal grd is greater than the third limit grd1 and less than the fourth limit grd2 for a third period of time T3; or the rate of change of the percentage opening of the accelerator pedal is greater than the fourth limit value grd2 for a fourth time period T4, and grd1< grd2, T4< T3. In this embodiment, when the rate of change grd of the percentage opening of the accelerator pedal is between the third limit grd1 and the fourth limit grd2 (i.e. grd1< grd < grd2) and lasts for T3 time, the driver is considered to have a certain power demand, and in order to meet the power demand of the driver, the automatic transmission is controlled to exit the neutral coasting state. And when the change rate grd of the percentage opening of the accelerator pedal is greater than the fourth limit value grd2 and lasts for the time T4, the situation that the driver has a stronger power demand is indicated, and therefore the automatic gearbox is controlled to exit the neutral coasting state. The T3 and T4 time periods are set to distinguish the case of driver's mistaken stepping or accelerator stepping at a certain point, eliminate the interference of driver's mistaken stepping or accelerator stepping at a certain point, and reduce the exit frequency of neutral coasting. It should be noted that when the rate of change grd of the percentage opening of the accelerator pedal is greater than the fourth limit value grd2, the power demand of the driver is strong, so the duration of T4 is set to a short period of time, such as 0.4s, 0.5s, or 0.6s, to facilitate the instant neutral coasting to respond to the power demand of the driver quickly. When grd1< grd < grd2 indicates that there is a certain power demand from the driver, to further avoid confusion with driver mis-steps, the duration of T3 may be set to a longer period of time, e.g., 1s, 1.5s, or 2 s. Since the change rate of the percentage opening of the accelerator pedal has different effects on the acceleration of the vehicle due to differences in the power, the load, and the like of different vehicles, the third limit value grd1 and the fourth limit value grd2 are adjusted according to specific test results of different types of vehicles.
In one embodiment, as shown in fig. 2, the method further comprises the following steps after controlling the automatic transmission to enter the neutral coasting state according to the first operating state parameter satisfying the first preset condition:
step S201: acquiring the running speed of a vehicle;
step S202: judging whether the running speed is in a second preset speed range, if so, executing a step S201, otherwise, executing a step S203;
step S203: and controlling the automatic gearbox to exit from the neutral coasting state.
In the present embodiment, the first preset speed range (V1, V2) is within the second preset speed range (V3, V4), i.e., V3< V1< V2< V4, and when the running speed is within the second preset speed range (V3, V4), it indicates that the vehicle is in a safe state in the neutral coasting state. When the running speed is not in the second preset speed range (V3, V4), that is, the running speed is less than V3 or the running speed is greater than V4. When the running speed is less than V3, the speed of the vehicle is slow, and the neutral coasting is not provided for saving the action value of the oil amount. When the running speed is higher than V4, which indicates that the running speed of the vehicle is too high, if the vehicle is still in the neutral coasting state, a braking safety hazard may exist, and therefore the automatic gearbox is controlled to exit the neutral coasting mode to ensure driving safety. It is emphasized that the second predetermined speed range is set to ensure that the entering condition (i.e. V1< V2) and the exiting condition (V < V3 or V > V4) of the driving speed V-related parameter are separated by a certain interval, so as to avoid the repeated jump of the judgment state caused by the driving speed V running to the vicinity of the boundary (e.g. V1 or V2).
In one embodiment, as shown in fig. 3, the method for controlling the automatic transmission to enter the neutral coasting state after the first operating state parameter satisfies the first preset condition further comprises the following steps:
step S301: acquiring the gradient of the vehicle;
step S302: judging whether the gradient is in a second preset gradient range, if so, executing a step S301, otherwise, executing a step S303;
step S303: and controlling the automatic gearbox to exit from the neutral coasting state.
In the present embodiment, the first preset gradient range (a1, a2) is within the second preset speed range (a3, a4), i.e., a3< a1< a2< a4, and when the gradient is within the second preset gradient range (a3, a4), it indicates that the vehicle is in a safe state in the neutral coasting state. When the gradient is not in the second preset gradient range (a3, a4), i.e., the gradient is less than a3, or the gradient is greater than a 4. When the gradient is less than a3, the vehicle is in a downhill state with a large gradient, and the neutral coasting may have a braking safety hazard. When the gradient is greater than a4, the vehicle is in an uphill state with a larger gradient, and if the vehicle is still in a neutral coasting state, a braking safety hazard may exist, so that the automatic gearbox is controlled to exit the neutral coasting mode to ensure driving safety. It is emphasized that the second predetermined gradient range is set to ensure that the entering condition (i.e. a1< a < a2) and the exiting condition (a < a3 or a > a4) of the gradient a-related parameter have a certain interval, so as to avoid the repeated jump of the judgment state caused by the gradient parameter a running to the vicinity of the boundary (e.g. a1 or a 2).
In one embodiment, as shown in fig. 4, the method further comprises the following steps after controlling the automatic transmission to enter the neutral coasting state according to the first operating state parameter satisfying the first preset condition:
step S401: acquiring the rotating speed of an engine of a vehicle;
step S402: judging whether the rotating speed is greater than a second calibrated rotating speed value, if so, executing a step S402, otherwise, executing a step S401;
step S403: and controlling the automatic gearbox to exit from the neutral coasting state.
In this embodiment, when the rotation speed of the engine is greater than the second calibrated rotation speed nEng2, it is indicated that the rotation speed of the engine is too high, and a braking hidden danger exists, so that the automatic transmission is controlled to exit the neutral coasting state. The second calibration rotating speed nEng2 is greater than the first calibration rotating speed nEng1, so that a certain interval exists between the judgment condition nEng1 for entering the neutral coasting and the judgment condition nEng2 for exiting the neutral coasting, and repeated jump of the judgment state caused by the fact that the rotating speed parameter nEng runs to the vicinity of the boundary of the first calibration rotating speed nEng1 is avoided.
In one embodiment, after the automatic transmission enters the neutral coasting state, the automatic transmission is controlled to exit the neutral coasting state if the driver steps on the vehicle or changes the operating mode of the transmission to a non-automatic mode.
One specific embodiment of the present invention provides a method of controlling operation of an automatic transmission, the determining method including the steps of:
step S501: acquiring running speed, gradient, opening degree of an accelerator pedal, rotating speed of an engine of the vehicle, braking state of the vehicle and operation mode of a gearbox of the vehicle;
step S502: judging whether the conditions that the running speed is within a first preset speed range (V1, V2) and the gradient is within a first preset gradient range (a1, a2) and the opening degree of an accelerator pedal is smaller than a calibrated opening degree value (rAPP1) and the rotating speed of an engine of the vehicle is smaller than a first calibrated rotating speed value (nEng1) and the vehicle is in an unbraked state and a gearbox of the vehicle is in an automatic mode are met, if yes, executing a step S503, otherwise, executing the step S501;
step S503: controlling the automatic gearbox to enter a neutral coasting state;
step S504: acquiring the percentage opening of an accelerator pedal;
step S505: and judging whether the percentage opening degree rAPP of the pedal is larger than a second limit value rAPP3 and lasts for a second time T2, if so, executing a step S518, otherwise, executing a step S506:
step S506: judging whether the percentage opening degree of the pedal is larger than a first limit value rAPP2 and lasts for a first time T1, if so, executing a step S518, otherwise, executing a step S503:
step S507: acquiring the change rate grd of the percentage opening of the accelerator pedal;
step S508: determining whether the change rate grd is greater than a fourth limit value grd2 for a fourth time T5, if yes, performing step S518, otherwise, performing step S509:
step S509: judging whether the change rate grd of the percentage opening of the accelerator pedal is greater than a third limit value grd1 and continues for a third time T3, if so, executing a step S518, otherwise, executing a step S503:
step S510: acquiring the running speed V of a vehicle;
step S511: judging whether the running speed V is in a second preset speed range (V3, V4), if so, executing the step S503, otherwise, executing the step S518:
step S512: acquiring the gradient a of a vehicle;
step S513: judging whether the gradient a is in a second preset gradient range (a3, a4), if so, executing the step S503, otherwise, executing the step S518:
step S514: acquiring the rotating speed nEng of an engine of a vehicle;
step S515: judging whether the rotation speed nEng is greater than a second calibrated rotation speed nEng2, if so, executing a step S518, otherwise, executing a step S503:
step S516: acquiring the operation mode of a brake-shaped or automatic gearbox of a vehicle;
step S517: judging whether the vehicle is in a braking state or the automatic gearbox is in a manual operation mode, if so, executing a step S518, otherwise, executing a step S503:
and step S518, controlling the automatic gearbox to exit the neutral coasting state.
According to an embodiment of the present invention, there is provided an automatic transmission, as shown in fig. 5, an automatic transmission 100 including: a clutch actuator 110 and a transmission controller 120. Specifically, the transmission controller 120 includes a transmission control device and a computer readable storage medium, the transmission control device being configured to read and execute control instructions in the computer readable storage medium. The clutch actuator 110 causes the automatic transmission 100 to enter neutral coasting or exit neutral coasting by performing a disengaging or engaging action. The gearbox control means comprises an acquisition unit 121, a decision unit 122 and a control unit 123. The obtaining unit 121 is configured to obtain a first operating state parameter and an opening parameter of an accelerator pedal. The determining unit 122 is configured to determine whether the first operating state parameter satisfies a first preset condition and determine whether the opening degree parameter satisfies a second preset condition. The control unit 123 controls the clutch actuator 110 to perform a disengagement operation to bring the automatic transmission 100 into a neutral coasting state according to the first operating condition parameter satisfying the first preset condition, and the control unit 123 further controls the clutch actuator 110 to perform an engagement operation to bring the automatic transmission 100 out of the neutral coasting state according to the opening parameter satisfying the second preset condition. When the opening parameter of the accelerator pedal meets a second preset condition, the control unit 123 controls the clutch actuator 110 to execute the engagement action again to enable the automatic transmission 100 to exit the neutral sliding mode, so that the condition that the automatic transmission exits the neutral sliding mode only by stepping on the accelerator by a driver is avoided, the frequency of entering and exiting the neutral sliding mode is reduced, the time ratio of the neutral sliding mode is increased, the oil consumption of the whole vehicle is reduced, and the heat management performance is improved. In an exemplary embodiment, the determination unit 122 includes an RS flip-flop, and the state is maintained or determined by the RS flip-flop.
According to an embodiment of the present invention, there is provided a vehicle, as shown in fig. 6, a vehicle 200 including: the automatic transmission comprises an automatic transmission 100, a vehicle speed sensor 201, a gradient sensor 202, an accelerator opening degree detection device 203, a rotating speed detection device 204 and a brake detection device 205, wherein the vehicle speed sensor 201, the gradient sensor 202, the accelerator opening degree detection device 203, the rotating speed detection device 204 and the brake detection device 205 are all electrically connected with a transmission controller of the automatic transmission 100. In detail, the vehicle speed sensor 201 is configured to detect a traveling speed of the vehicle 200 and transmit the traveling speed data to the acquisition unit 121 of the automatic transmission 100; the gradient sensor 202 is used for detecting the gradient of the vehicle 200 and transmitting the gradient data to the acquisition unit of the automatic transmission 100; the accelerator opening degree detection device 203 is used for detecting an opening degree parameter of an accelerator pedal of the vehicle 200 and transmitting the opening degree parameter to an acquisition unit of the automatic transmission 100; the rotational speed detection device 204 is configured to detect a rotational speed of an engine of the vehicle 200 and transmit the rotational speed data to an acquisition unit of the automatic transmission 100; the braking detection device 205 is configured to detect a braking status of the vehicle 200 and transmit the braking status data to the obtaining unit of the automatic transmission 100. The vehicle 200 provided by the invention can control the operation of the automatic gearbox 100 according to the control method for the operation of the automatic gearbox 100, the safe working conditions of the vehicle 200 and an engine are identified through detecting a plurality of variables, and meanwhile, the driving scene and the intention of a driver of the vehicle 200 are accurately identified, so that the reasonable entering and exiting conditions of the AMT automatic gearbox in the neutral sliding mode are ensured, and the condition that the vehicle exits the neutral sliding mode only by stepping on an accelerator by the driver is avoided, thereby reducing the entering and exiting frequency of the neutral sliding mode, increasing the time ratio of the neutral sliding, reducing the oil consumption of the whole vehicle, and improving the heat management performance.
The control method for the operation of the automatic gearbox provided by the invention carries out real vehicle verification on a 49-ton tractor, the preset value of a small accelerator can be 30%, the power requirement of a driver and the safety of a vehicle are not influenced, the time proportion of neutral sliding is improved by 28.3%, the number of times of entering and exiting of the neutral sliding is reduced, and the oil consumption of the whole vehicle, a heat pipeline and the driving experience are improved.
The invention has the advantages that: on the premise of not changing hardware and increasing cost, the safety working conditions of the vehicle and the engine are analyzed by using the electric control signal, the driving scene and the intention of a driver of the vehicle are accurately identified, the neutral sliding proportion of the commercial vehicle is improved, and the dual performance improvement of the oil consumption and the heat management of the whole vehicle is realized.
In the long-distance transportation sliding process, in order to maintain the whole vehicle scenes of accelerator stepping or small accelerator stepping and the like at the vehicle speed point, the driver does not exit the neutral sliding mode, the neutral sliding strategy is further optimized, and the dual performance improvement of the whole vehicle oil consumption and the heat management is realized.
Those skilled in the art can understand that, the sequence of each step in the embodiment of the present application is only a preferred embodiment of the present application, and is only for convenience of explaining the technical scheme and the technical effect of the present application, and is not limited to the sequence of each step.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A method of controlling operation of an automatic transmission, the method comprising:
acquiring a first running state parameter of a vehicle;
judging whether the first running state parameter meets a first preset condition or not;
controlling the automatic gearbox to enter a neutral sliding state according to the condition that the first running state parameter meets the first preset condition;
acquiring an opening parameter of an accelerator pedal;
judging whether the opening degree parameter meets a second preset condition or not;
and controlling the automatic gearbox to exit from a neutral sliding state according to the condition that the opening degree parameter meets the second preset condition.
2. The method of controlling operation of an automatic transmission according to claim 1,
the opening degree parameter of the accelerator pedal comprises: a percent opening of the accelerator pedal;
the meeting of the second preset condition comprises:
the percentage opening degree of the accelerator pedal is greater than a first limit value and less than a second limit value and lasts for a first time period; or
The percentage opening degree of the accelerator pedal is larger than a second limit value and lasts for a second time period;
wherein the second limit is greater than the first limit and the first time period is greater than the second time period.
3. The method of controlling operation of an automatic transmission according to claim 1,
the opening degree parameter of the accelerator pedal comprises: a rate of change of percent opening of the accelerator pedal;
the meeting of the second preset condition comprises:
the change rate of the percentage opening of the accelerator pedal is greater than a third limit value and less than a fourth limit value and lasts for a third time period; or
The rate of change of the percent opening of the accelerator pedal is greater than a fourth limit for a fourth period of time;
wherein the fourth limit is greater than the third limit and the third time period is greater than the fourth time period.
4. The method of controlling operation of an automatic transmission according to claim 1,
the first operating state parameter includes:
a driving speed, a gradient, an opening degree of an accelerator pedal, a rotating speed of an engine of the vehicle, a braking state of the vehicle, and a transmission operating mode of the vehicle;
the first operation state parameter meeting a first preset condition comprises:
the running speed is within a first preset speed range, the gradient is within a first preset gradient range, the opening degree of an accelerator pedal is smaller than a calibrated opening degree value, the rotating speed of an engine of the vehicle is smaller than a first calibrated rotating speed value, the vehicle is in a non-braking state, and a gearbox of the vehicle is in an automatic mode;
wherein the calibrated opening value is smaller than a first limit value.
5. The method of controlling operation of an automatic transmission according to claim 4,
controlling the automatic gearbox to enter a neutral coasting state according to the condition that the first running state parameter meets a first preset condition, and then:
acquiring the running speed of the vehicle;
judging whether the running speed is in a second preset speed range or not;
if not, controlling the automatic gearbox to exit a neutral coasting state;
wherein the first preset speed range is within the second preset speed range.
6. The method of controlling operation of an automatic transmission according to claim 4,
controlling the automatic gearbox to enter a neutral coasting state according to the condition that the first running state parameter meets a first preset condition, and then:
acquiring the gradient of the vehicle;
judging whether the gradient is in a second preset gradient range or not;
if not, controlling the automatic gearbox to exit from a neutral sliding state;
wherein the first predetermined gradient range is within the second predetermined gradient range.
7. The method of controlling operation of an automatic transmission according to claim 4,
controlling the automatic gearbox to enter a neutral coasting state according to the condition that the first running state parameter meets a first preset condition, and then:
acquiring the rotating speed of an engine of the vehicle;
judging whether the rotating speed is greater than a second calibrated rotating speed value or not;
if so, controlling the automatic gearbox to exit from a neutral sliding state;
and the second calibrated rotating speed value is greater than the first calibrated rotating speed value.
8. The method of controlling operation of an automatic transmission according to claim 4,
controlling the automatic gearbox to enter a neutral coasting state according to the condition that the first running state parameter meets a first preset condition, and then:
acquiring the brake state of the vehicle or the running mode of the automatic gearbox;
and controlling the automatic gearbox to exit a neutral coasting state when the vehicle is in a braking state or the automatic gearbox of the vehicle is in a manual mode.
9. An automatic transmission for executing a control method of an operation of an automatic transmission according to any one of claims 1 to 8, characterized by comprising:
a clutch actuator;
a transmission controller comprising a transmission control device and a computer readable storage medium, the transmission control device configured to read and execute control instructions in the computer readable storage medium, the transmission control device comprising:
the acquiring unit is used for acquiring a first running state parameter and an opening parameter of an accelerator pedal;
the judging unit is used for judging whether the first running state parameter meets a first preset condition or not and judging whether the opening degree parameter meets a second preset condition or not;
and the control unit controls the clutch actuating mechanism to execute a separation action to enable the automatic gearbox to enter a neutral coasting state according to the condition that the first running state parameter meets the first preset condition, and controls the clutch actuating mechanism to execute an engagement action to enable the automatic gearbox to exit the neutral coasting state according to the condition that the opening degree parameter meets the second preset condition.
10. A vehicle, characterized in that the vehicle comprises:
the automatic transmission according to claim 9;
a vehicle speed sensor for detecting a vehicle running speed;
a gradient sensor for detecting a gradient of a road on which the vehicle is located;
the accelerator opening detection device is used for detecting an opening parameter of an accelerator pedal of the vehicle;
rotation speed detection means for detecting a rotation speed of an engine of the vehicle;
the brake detection device is used for detecting the brake state of the vehicle;
the speed sensor, the gradient sensor, the accelerator opening degree detection device, the rotating speed detection device and the brake detection device are all electrically connected with a gearbox controller of the automatic gearbox.
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